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Restructuring, Asset-Related, and Other Charges, Net (Charges) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Restructuring And Related Activities [Abstract]    
Employee separation charges $ 3 $ 0
Decommissioning and other charges, net 7 12
Total restructuring, asset-related, and other charges, net $ 10 $ 12